| Name: V. Muthu Priyal |
| Affiliation: Indian Institute of Astrophysics |
| Conference ID: ASI2026_948 |
| Title: Fe XIV 5303 Å observations with VELC/Aditya-L1, and near-Sun coronal dynamics |
| Abstract Type: Invited |
| Abstract Category: Sun, Solar System, Exoplanets, and Astrobiology |
| Author(s) and Co-Author(s) with Affiliation: V. Muthu Priyal(Indian Institute of Astrophysics, Bengaluru - 560034, INDIA), R. Ramesh(Indian Institute of Astrophysics, Bengaluru - 560034, INDIA), Jagdev Singh(Indian Institute of Astrophysics, Bengaluru - 560034, INDIA), Sasikumar Raja(Indian Institute of Astrophysics, Bengaluru - 560034, INDIA), Savarimuthu p(Indian Institute of Astrophysics, Bengaluru - 560034, INDIA) |
| Abstract: The Visible Emission Line Coronagraph (VELC) onboard Aditya-L1 has opened a
new observational window for probing the near-Sun solar corona through high-
cadence spectroscopy in the Fe XIV 5303 Å emission line. In this presentation, we
report scientific results published in the last one year from VELC sit-and-stare and
raster-scan observations, focusing on coronal mass ejections (CMEs), flares, and
“quiet” corona in the height range of ~ 1.05 - 1.50 solar radii. The results reveal new
spectroscopic signatures in 5303 Å , associated with CME onset and evolution,
intensity enhancements, coronal dimmings, Doppler velocity patterns, and line
broadening. Time-resolved measurements provide direct evidence of plasma and
magnetic restructuring in the low corona prior to and during eruptive activity. We
present diverse observations including flare-less CMEs, CME-less flares, and weak
CMEs. Raster-scan observations help in two-dimensional mapping of coronal plasma
parameters, facilitating the spatial characterization of variations in both eruptive and
quiescent coronal structures. |
